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the answer is yes, but also depends on variants and what you want to be able to do!

The use of "hacker" to mean "security breaker" is a confusion on the part of the mass media. We hackers refuse to recognize that meaning, and continue using the word to mean, "Someone who loves to program and enjoys being clever about it."--------------------"Its not a bug, its a feature" (Epic Games)

No, it doesn't depend on the variants. When he says Unix, he means either linux or BSD. I can say that and know I'm right, because commercial Unix systems cost shitloads of money. And I know he wants it free. They all come with either LILO or GRUB, so the answer is yes, it doesn't matter what variant, and it doesn't matter what you want to be able to do.